What’s Vulnerable › Vulnerabilities

CVE-2019-11708: Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-05-23
• EPSS: 55.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-07-23 · updated 2026-06-17
• Weakness: CWE-20

Description

Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.

Affected products

• Mozilla Firefox: before 60.7.2; before 67.0.4 — fixed in 60.7.2, 67.0.4
• Mozilla Thunderbird: before 60.7.2 — fixed in 60.7.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.7.2, 67.0.4; Mozilla Thunderbird 60.7.2. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1559858
• https://security.gentoo.org/glsa/201908-12
• https://www.mozilla.org/security/advisories/mfsa2019-19/
• https://www.mozilla.org/security/advisories/mfsa2019-20/
• http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1559858
• https://security.gentoo.org/glsa/201908-12
• https://www.mozilla.org/security/advisories/mfsa2019-19/
• https://www.mozilla.org/security/advisories/mfsa2019-20/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11708

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